Google expanded aggregator and supplier units to local business queries. These experiences concern the European Economic Area and distinguish eligible aggregators from businesses that provide a service directly. Source officielle.
A practical check
For a local provider, check the service page, coverage area, contact details, and crawlable links. For an aggregator, read the eligibility and data requirements before assuming participation.
A plumbing company is a direct supplier; a directory listing many plumbers is an aggregator. Their participation rules are not interchangeable. The supplier should keep service pages crawlable and accurate; an aggregator should review Google's eligibility process.
What the evidence supports
Inspect results for relevant queries and countries; do not attribute every local ranking change to this new format. A direct supplier does not follow the same process as an aggregator. Date the check and retain the source documentation so that later changes can be verified.